Chemistry

Question 1

Name the first 20 elements and their symbols

Answer 1

Hydrogen (H), Helium (He), Lithium (Li), Berylilium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne), Sodium (Na), Magnesium (Mg), Aluminum (Al), Silicon (Si), Phosphorus (P), Sulfur (S), Chlorine (Cl), Argon (Ar), Potassium (K), Calcium (Ca)

Question 2

What are the 2 most reactive groups

Answer 2

Alkali Metals, Halogens. Reactivity generally moves top to bottom with top being less reactive and bottom being more. This is because lower shells have more electrons so it’s easier to gain or lose them

Question 3

Name the following elements from their symbols
- I
- Rn
- Au
- Br
- Ti
- Cu
- Pb
- Ni

Answer 3

• Iodine
• Radon
• Gold
• Bromine
• Titanium
• Copper
• Lead
• Nickel

Question 4

Elements are seperated into three categories which are

Answer 4

Metal, Metalloids, Non-metals

Question 5

Chemical compounds are divided into types, they are

Answer 5

Ionic, Molecular

Question 6

Name everything you can about Ionic Compounds

Answer 6

• Have at least 1 metal
• Disassociate in water
• Have ionic bonds (use magnetic forces to keep together)
• Conduct electricity when dissolved in water
• Have higher melting/ boiling points.

Question 7

What are cations and anions

Answer 7

Cations are atoms with positive charges, anions are atoms with negative charges

Question 8

Name all you can about molecular compounds

Answer 8

• Made exclusively from non-metals
• Share electrons
• Have covalent bonds which are crazy strong
• Some are soluable in water but not all
• Don’t disassociate in water
• Don’t conduct electricity
• Lower melting/ boiling points in general

Question 9

How do you name ionic compounds?

Answer 9

1. Write entire name of first element
2. Change non-metal component ending to “ide”

eg. NaCl: Sodium Chloride

Question 10

How do you name a molecular compound

Answer 10

1. Write entire name of the first element
2. Add a prefix to it to denote the amount, if there’s only 1 skip this step.
3. Change last element’s ending to ide and add a prefix to show the amount of atoms

eg. C02: Carbon Dioxide

Prefixes
- Mono: 1
- Di: 2
- Tri: 3
- Tetra: 4
- Penta: 5
- Hexa: 6
- Hepta: 7
- Octa: 8
- Nona: 9
- Deca: 10

Question 11

Oxygen is often representative of ___ in equations

Answer 11

HEAT!

Question 12

What’s an exothermic reaction

Answer 12

Reactions that exert heat

Question 13

What’s an endothermic reaction

Answer 13

Reactions that absorb heat

Question 14

What’s a reactant

Answer 14

The substances that react with eachother in a chemical equation

Question 15

What’s a product

Answer 15

The substances created from a chemical equation

Question 16

How do you find the amount of Protons and Electrons in an atom

Answer 16

Both are equal to the atomic number

Question 17

How do you find the amount of neutrons in an atom

Answer 17

Atomic mass - Atomic number. If the atomic mass is a decimal (which it probably is) round up.

Question 18

What’s the Law of Conservation of Mass (or more commonly, The Law of Equivalent Exchange!!!!)

Answer 18

What goes into an equation comes out just in different forms. If you put in 3 oxygen 3 oxygen will come out, but maybe they’re H20s instead

Question 19

What effects reaction rate

Answer 19

• Temperature (The hotter it is the faster the reaction)
• Concentration
• Surface area

Question 20

What’s a catalyst

Answer 20

Something that speeds up a reaction but is not consumed in the process

Question 21

What’s an inhibitor

Answer 21

Something that slows down a reaction